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README.md
Webpack Virtual Modules
Webpack Virtual Modules is a plugin that allows for dynamical generation of in-memory virtual modules for JavaScript builds created with webpack. When virtual module is created all the parent virtual dirs that lead to the module filename are created too. This plugin supports watch mode meaning any write to a virtual module is seen by webpack as if a real file stored on disk has changed.
Installation
Use NPM or Yarn to install Webpack Virtual Modules as a development dependency:
# with NPM
npm install webpack-virtual-modules --save-dev
# with Yarn
yarn add webpack-virtual-modules --dev
Usage
You can use Webpack Virtual Modules with webpack 5, 4 and 3. The examples below show the usage with webpack 5 or 4. If you want to use our plugin with webpack 3, check out a dedicated doc:
Generating static virtual modules
Require the plugin in the webpack configuration file, then create and add virtual modules in the plugins
array in the
webpack configuration object:
var VirtualModulesPlugin = require('webpack-virtual-modules');
var virtualModules = new VirtualModulesPlugin({
'node_modules/module-foo.js': 'module.exports = { foo: "foo" };',
'node_modules/module-bar.js': 'module.exports = { bar: "bar" };'
});
module.exports = {
// ...
plugins: [
virtualModules
]
};
You can now import your virtual modules anywhere in the application and use them:
var moduleFoo = require('module-foo');
// You can now use moduleFoo
console.log(moduleFoo.foo);
Generating dynamic virtual modules
You can generate virtual modules dynamically with Webpack Virtual Modules.
Here's an example of dynamic generation of a module. All you need to do is create new virtual modules using the plugin
and add them to the plugins
array. After that, you need to add a webpack hook. For using hooks, consult webpack
compiler hook documentation.
var webpack = require('webpack');
var VirtualModulesPlugin = require('webpack-virtual-modules');
// Create an empty set of virtual modules
const virtualModules = new VirtualModulesPlugin();
var compiler = webpack({
// ...
plugins: [
virtualModules
]
});
compiler.hooks.compilation.tap('MyPlugin', function(compilation) {
virtualModules.writeModule('node_modules/module-foo.js', '');
});
compiler.watch();
In other module or a Webpack plugin, you can write to the module module-foo
whatever you need. After this write,
webpack will "see" that module-foo.js
has changed and will restart compilation.
virtualModules.writeModule(
'node_modules/module-foo.js',
'module.exports = { foo: "foo" };'
);
More Examples
- Swagger and JSDoc Example with Webpack 5
- Swagger and JSDoc Example with Webpack 4
- Swagger and JSDoc Example with Webpack 3
API Reference
Inspiration
This project is inspired by virtual-module-webpack-plugin.
License
Copyright © 2017 SysGears INC. This source code is licensed under the MIT license.